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Power-Management Registers
SLEEPCMD (0xBE) – Sleep-Mode Control Command
Bit Name Reset R/W Description
7
OSC32K_CALDIS
0 R/W Disable 32-kHz RC oscillator calibration
0: 32-kHz RC oscillator calibration is enabled.
1: 32-kHz RC oscillator calibration is disabled.
This setting can be written at any time, but does not take effect before the chip has
been running on the 16-MHz high-frequency RC oscillator.
6:3 – 000 0 R0 Reserved
2 – 1 R/W Reserved. Always write as 1
1:0
MODE[1:0]
00 R/W Power-mode setting
00: Active / Idle mode
01: Power mode 1 (PM1)
10: Power mode 2 (PM2)
11: Power mode 3 (PM3)
SLEEPSTA (0x9D) – Sleep-Mode Control Status
Bit Name Reset R/W Description
7
OSC32K_CALDIS
0 R 32-kHz RC oscillator calibration status
SLEEPSTA.OSC32K_CALDIS shows the current status of disabling of the 32-kHz
RC calibration. The bit is not set to the same value as
SLEEPCMD.OSC32K_CALDIS before the chip has been run on the 32-kHz RC
oscillator.
6:5 – 00 R Reserved
4:3
RST[1:0]
XX R Status bit indicating the cause of the last reset. If there are multiple resets, the
register only contains the last event.
00: Power-on reset and brownout detection
01: External reset
10: Watchdog Timer reset
11: Clock loss reset
2:1 – 00 R Reserved
0
CLK32K
0 R The 32-kHz clock signal (synchronized to the system clock)
67
SWRU191C–April 2009–Revised January 2012 Power Management and Clocks
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